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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f89df0806332c963581612e1c1c5a8cb712e4485eaad6aae25ae97a84859c2b0' 
  AND token = '7n5Ka5uEdVW70vFvnKI+qSDm43cOmBiPwyq/O5IRrzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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