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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '548a0049c8e54a154e27cfb642d729c7f813429b5c57d40a3aaf17b94b4a224b' 
  AND token = 'fb0y+hCt2O5NBzLhjF+j2+poVO8JdK5af1MbpNaG490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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