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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfdd928634cd65ad89af44531a0db8e8b66dc2b028a0373942b80e415f5460d1' 
  AND token = 'LLK9SackVnnWik/bN/eutMIwKaZ85i4rruKH6hIGpqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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