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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29147ddfffb3cf8fc74b509a5cec348de133d2757f379e6430b7ae503abd6e6e' 
  AND token = 'VR1RW+uwCAc4UbROr8e5kq+mqwbbWE3fzlWk7tn19Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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