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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ee0b903488c71856e14b2ed2e4b1d8a2ad706e0174ea578b9c713bdd6aca415' 
  AND token = 'EZktA+CSkkRWtBR/jxtE05OL3hcMWTau9/j/bIPNklc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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