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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '236835aa6ae5ef08841fefc97a03f25c5fb54ef452f25c08e432f1cafc764c45' 
  AND token = '6BiDOXr8wrdNTYlUcrXvFRm/BfMIIqRn1s/tg4jvhm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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