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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3568ed54bf0b408b19b39d25df45c01d54235eaf4e4da02b42a0ec8455ce79c8' 
  AND token = 'YWMIhcBMwcwGwnxorOGSkt6XRG7GT7ZbiUa0Rwx/YcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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