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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f0f2b687f95feedc7108da2409f56dd0fa575c557e0b6ccee811e53183e329f' 
  AND token = 'pcDPi+4VTjq8gj+eFgHg2D4z3mx38MiXQQVNPmWlPfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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