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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e501734eefb0ad513cc608f1984bd8c2469f0df3c156ff0b3012d2e6c4001e8' 
  AND token = '0d7NQOoDvnpwZb/FhryJkNsecDfu9AD3IBKZBJoZTqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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