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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab096004d8f7791b6114b9fa2d419690ed07e24059e1ba50517f09e59ead8b49' 
  AND token = '8AOILzcat9MUeV8IQSQ3YsAkqrkmrFmjLweNo24IqSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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