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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6004538c37b186815ec40ed3e582590d1314e0b1c2655e5922dfe7a1802478fd' 
  AND token = 'S2aFN3TtAp3R6M55A6Z2V5QaCa+QRINiCT97PEVO0qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}