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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bc5b35f382c1813c6cf97ecc234f7ea68be645f37733a4521864fcb8cacf2bd' 
  AND token = 'P0kLQaM5A3mGK7w10JxWF/XAZv9MjR1aeeEE/aFgrZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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