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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108121a490a7238c86a2ce601afd18a28e6809b77039045e269cf9aa1b1ac21c' 
  AND token = '6zFnz6S2gEeIASl2R+gwxg+mZIn8wul/Ll2GQYG4Bfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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