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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bd981c5f4f8d63fe4d94ad8ed8f7c1ba0fb169c597bcff579e3d310a371961a' 
  AND token = 'ry48QOfAxQCTNRGDPW05/BqzPUGNHSRK62IqYnyBSTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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