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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f725e3d16525439c2f8f4b15af0d7c80c2bbc514c06de8698ac32f7aa0df88' 
  AND token = 'GlWXYUneMiMPLfjVTtu+/r2X8OmpdVO2Oxhra2i3Cmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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