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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f512f29fdc19adbcb3851bc3442285f9a116cb54e8f4247865cbd27674d809b4' 
  AND token = 'LEapLSZuF8TDPb1SLVdn27JIJAl7kQQCBSHe7v2TPI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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