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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fc6b10e4707510fc2aa8d434d9ca1d0e714ae0cf8105e59abd295dd45c43606' 
  AND token = 'fV6yVR5OyBmIl2d0B76xCgsePLo8ITpbuzH2R40cjVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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