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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32b07335d5a5525900882a1b2b78b36fb1b617d016938f5d4a143b7cbe7f9018' 
  AND token = 'Yr3i1YR3k5UH3cAzbYHNpDCEjHcghfgJPyhSkDB3VBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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