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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4bde87815b6b6bb31c0aa52ceb57ec710954558a0d0c8ba4c5218008cfdb786' 
  AND token = 'xPgL7JWlDX8lpvFwfXiCVUBbrtCCGUeL3th5NATeUcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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