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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3232a678c96a11fe07073dcebf3ed3f25bc8bc24f6fb1a9d94a2169afe993930' 
  AND token = 'YsusN/yDPb+GyUXJOZUcYJ+n4ENnOSH0HoIc6J+n2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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