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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea4590957b0d91d011d3bd5295ab5aa0a0f5304b858ef8eef607e965d3a56b3c' 
  AND token = 'KaFIhRxa5Kiom9xJTP+GysIUZFVszwzIkMPbPN47z/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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