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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '545b5ba1813a737fb2c2a5712e826ff5be6bc6a362a70f725042ac7fc36ea786' 
  AND token = 'ZYclUEp9tJIqjOPea0MCQvN2wnwh6jEiIkMzQH5JLB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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