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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c660afa092061763d3d428ed8c111f28e95e056998afea04c34c3666559d63c' 
  AND token = 'On6Oz6rml0HY3S76GIINAGDcCr33iBMC+sCxWtq+AiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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