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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f039fa519dad71b9101636cd72b00357c53bc7d39ec5a34eb3aafe2faf8fdf4d' 
  AND token = 'FSTnvFfvfemVxva0fB84iOjmMifcJczaW3/Bp51AiGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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