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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f1cdafa35469d7ff58e03efc50b965dfeaad2610a33ad0c22c1d68bfc198a02' 
  AND token = 'uMw4b6g4FCSf7dVZvfVGlY68RdX/iNi09P6Ir2AvF2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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