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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0ad8a63cb97f9601e03a603d6bb2188d06112a8699246d33be13b6c384f5de2' 
  AND token = 'HIH0A1lc3Ct/QhHa1aGCx95iinFakbnvxcwvOqfJ9Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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