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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c264f8d6b508e1389f2faacf23417dbaba53223e11619ef0fe8eaa683ede87fe' 
  AND token = '0tl7EtYh23j+f477RQuk8/H0f0Zcnjm8JR/JIDLD4kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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