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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03e786896a5ba3ad1f3466aa251f0fa75b0eea0a3ffbcd19b42f5c4e83c4c3cf' 
  AND token = 'gfYY3yTXNq+mLiZAsASsRuBScRubxB3VlMRQvqietQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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