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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d013c04e3e50d0ba85fac12466808a1835789392eae42e36bd8256230a5d04' 
  AND token = 'I76HeQERaI+zSG/u21i8Qwm+ogTJxroiQl1AVXOcRc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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