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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be26cf42b1c3af28013ed83d3f3cd51b1550a7a0fdac0a68ad216b2c1bc9d39' 
  AND token = 'tT01aCtow3AiXdqlaBS0sjA+wtIcTKbVfvLsJELO1R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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