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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03d32966f74676307e29fdcb24c6ebea3e6b1ae4a663c8ccdb06ed86b76f65c6' 
  AND token = 'cEwnkkNG4fpGlmkCH98T0ir5J/a5869kLuclBL8jVUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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