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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd66580fb042231b25c28367fe686ff68d3776fb5e453b082a00aa11cb202c0e7' 
  AND token = 'lnG+4FitzYMx1d++5cE0HSYC7qbrCTQPpyXEe3GHmFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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