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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26e0aa412c96cf5c314ce8c52c5f9be7284d9517ee0b27ab6a768efbec7d49a0' 
  AND token = 'Sdf0xC6i50yWYtYVLpkJItxlGbDC28IyU2xUw1DcptY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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