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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d86503a6bb9a1ffa047a33d23fa1a3fa2cc40fcee651dc16fd6beca988a3286' 
  AND token = 'pLBaVPTHpG6qZsOj3i+WP44YZgnFzqOvycyNBer4ejQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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