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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20c3fc770f0521af6a838b7a6d621ea3dc2caa666e4320ab8cff8afa972adc03' 
  AND token = 'pA7//Jy9N3pXv02MDXv5sUbpvPqjODAtUJwpgC81WZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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