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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '210210d47307d83c42f38a4256373cb7a4fad44d847d13a0f22e5a58615d865d' 
  AND token = 'r4ibzQ/yqHNzQerN0VBzcdBuk6CgfIQ7Cpg65RRH4xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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