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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0889e0bfd0a59f7e11cdb1131d1ce21341191105ed01fc24f5bca8015850f32' 
  AND token = '1CmaZUaBvJ9mrYecxlZay9O+2hD8995Nt6whCsypapY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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