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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '925e67fd56688c5ef304b42cfb8787445501bd524d6b056c41d1f9e1e484384f' 
  AND token = 'lyN6TNfPsaa1ALWQ1vc5agF8tDJU2wid0fXejXzsjiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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