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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbce77f0505f11bcd9feba943d28a8fa2bbb10ca0257acbde78cb958d70e16ba' 
  AND token = 'pLZF54hTBa3q3+y4C08N2TYXJRuM7NJ2CwQUiYtt0ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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