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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9db83c46d2a7a0f2241cd2e717960cf461f1229af4591b0ba408f5675fd9871' 
  AND token = 'X1A5I/ODsK62qbfCzEevIzp3+4tXO78H4Q9dLtQqVtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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