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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71202d31b35a9d0b0628c8613e983399783b715445db6b2a3be9279dbeb0d6a3' 
  AND token = '4eQ9IY/RgJcZJxM74Es6OMtbATreQ85li5j8yfPpLa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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