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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1db60a4ec753e7052e93f480345cec282e046cd4a0b02019460c3f4c4b2e15e8' 
  AND token = 'h4DqzMEhuTpYz2ylzxgppN8g610o/1j/35M0bx1aLcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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