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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd38e6e2c98203c84007fd8fab0afc3744eff53a6012eff1c594a1ed43618fba' 
  AND token = 'A19DKZC7xHIByyvAyUlsWlVTF6VOSnwHgPon1MxEFso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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