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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed4240ab978288f810c0375ab78bd761c45f0b64619b5c200d6b7356c259b3ad' 
  AND token = 'LFesySbhjhiNeFNxyJ2mvGK250nJi03VxVqfMTWt2f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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