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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b99b3d17560440c047b80af4e969169742900e02969862e63507ecbf14f0e3d7' 
  AND token = 'UapSQ/tnfAcuXJojAwDXILwIR2WXobw82KJI+AHY2zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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