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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e93f7a80bcc3adc2e48e7079a45325746bac94a72f2f4f5be093eb60fc7079f3' 
  AND token = 'RyP5hrUlPWTx1nUrkLMuEijqdUkP5t+cT+sTRPkB6W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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