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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '127dc2a9e7f3d0effa3b0f924ea7f8e5d463ad7ac1ecdb075702569a5dba8648' 
  AND token = 'Af60EeSTLdxO3ih2L9heZzOItrAnwZBr53s0QlqhTsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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