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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b535edce42cdf2a068dd8d6c8a1316006992c03948d5e47b83eec4c841a3092' 
  AND token = 'hhK41noHN0U0f/trKZaK1AWubISPKZy7yw/8rfp1Q9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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