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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bac058098b3c6759a87ee1b3087c14dab5746c711ee8f079b5f21ae918df2bf4' 
  AND token = 'CRdYjh30QdL7tfQDY7FiizXbYLA+wFyk+dqTUP/0Fv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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