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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8822dc9217cbc0083965ef1baad2528010d226e603d645ebb5c2f01f6ca435d' 
  AND token = 'RW7yfMdwwmyV4XKaRbugxerHbah2y1B0ZvMlV/FF+ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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